Installation

Before starting, we need Node to be Installed on our machine.

Reference for Node Installation

Create a New Directory:

Create a new directory for your Express.js application. You can name it anything you like; for example, first-express-app.

Initialize new node.js application:

Navigate to the Newly created Directory, Initialize a new Node.js application by running the following command. This will create a package.json file where your project dependencies will be stored.

Example:

cd first-express-app

npm init -y

Use npm (Node Package Manager) to install Express.

npm install -g express

The above command install an `express` package in the node_module directory and creates a directory named `express` inside the node_module folder in the root directory of your current folder. Additionally, it updates the package.json file with the Express dependency.

Note: -g tag is used to install package globally

Import `express` module:

const express = require('express');
const app = express();

const PORT = process.env.PORT || 3000;

process.env.PORT: PORT Variable initialize in Environment variable file. if the `PORT` variable is not found in `env` file then use `3000` as a default port

Add Routes using express module:

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.post('/add-user', (req, res) => {
  console.log(req.body)
  res.send('User Data Recieve');
});

Start server on specific port:

app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Heading

const express = require('express');
const app = express();

const PORT = process.env.PORT || 3000;

app.get('/', (req, res) => {
  res.send('Hello World!');
});

app.post('/add-user', (req, res) => {
  console.log(req.body)
  res.send('User Data Recieve');
});

app.listen(PORT, () => {
  console.log(`Server is running on http://localhost:${PORT}`);
});

Example:

node server.js

Copy above code and save in file named server.js and Run the above code through below mentioned command.

Open http://127.0.0.1:3000/ in your browser to see the result.

Output:

// Output in Console ---> Server is running on http://localhost:3000
// Output in Browser ---> Hello World!

Note:

After following above listed steps, you'll have Express.js installed in your project, and you can start building your web application using this powerful framework. You can create a new Javascript file (e.g., server.js) and start writing your Express application code by requiring the Express module and initializing your Express application.

<-- Home

Request -->